ISDN
In recent years, ISDN-based communications have made massive inroads into the telecom market. A technology that was once the exclusive preserve of corporate and business users is now the system of choice for even private subscribers.
ISDN NT1
In recent years, ISDN-based communications have made massive inroads into the telecom market. A technology that was once the exclusive preserve of corporate and business users is now the system of choice for even private subscribers.
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